Poás crater (IMAGE) Frontiers Caption The crater and its extremely harsh lake, Laguna Caliente, dominated by a single genus of extremophile Acidiphilium bacteria Credit Justin Wang Usage Restrictions Credit must be given to the creator. License CC BY Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.